Heterotrophic bacterial production in the Cretan Sea (NE Mediterranean)

Archive ouverte

van Wambeke, France | Christaki, Urania | Bianchi, Micheline | Psarra, Stella | Tselepides, Anastasios

Edité par CCSD ; Elsevier -

International audience. In March and September 1995, bacterial production was measured by the 3 H-leucine method in the oligotrophic Cretan Sea (Aegean Sea, Eastern Mediterranean) in the framework of the CINCS/MTP program. Samples were obtained from four stations (a coastal, a continental shelf and 2 open-sea stations) for the construction of vertical profiles of bacterial abundance and production. Bacterial production ranged from 0.1 µg C m 3 h 1 at 1500 m depth, to 82 µg C m 3 h 1 in March at 50 m at the coastal station. Higher bacterial integrated production was observed in March at the coastal station (131 mg C m 2 d 1 for the 0–100 m layer). Bacterial production, integrated through the water-column, was similar in March and September for the open-sea stations (60–70 mg C m 2 d 1). Relative to production, bacterial concentrations varied little between stations and seasons ranging from 9×10 5 ml 1 to 3×10 5 ml 1. Relationships between bacterial biomass and bacterial production indicated seasonal differences, likely reflecting resource limitation of bacterial biomass in March (bloom situation), and predator limitation of bacterial biomass in September (post-bloom situation).

• Description
• Sujet/Public
• Outil
• Outil d'anticipation
• Mémoire et thèse
• Gestion